CEACAM5 and laryngotracheoesophageal cleft: Compared to those who did not develop LC, LC patients were more likely to be older (55.0 vs. 39.0 years old, p < 0.001), and had a lower education level (67.7% vs. 39.0%, p < 0.001), poorer renal function (77.3 vs. 86.5 mL/min/1.73 m2, p < 0.001), a higher level of carcinoembryonic antigen (CEA) (2.3 vs. 1.5 mg/dL, p < 0.001), greater family history of LC (8.0% vs. 5.2%, p < 0.001), and more comorbidities.